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https://logi.wiki/index.php/ALL_SYS_PWRGD

2013-2017 is the same, 2012 is different.

https://logi.wiki/index.php/Magsafe_Sleep_Mode

Then UB300 is possibly defective.

Proximity means "near something", so here the sensors are near the CPU (rather than inside it, which is another sensor), near the RAM, near the Thunderbolt controller, near the camera controller, etc… First you have to confirm if the sensors problem is solved after disconnecting webcam. Only...

TBT = Thunderbolt MLB = Main Logic Board BOT = Bottom TBD = To Be Determined (ie. they didn't know where to place that sensor yet when designing schematics) BMON = Battery monitoring I might be wrong but I think it goes like this (unlike the hints in the schematics seem to imply, also note that...

PCH getting warm when the machine is turned on is normal.

There's nothing else on the line to pull it down, so yes it'll be around 1.05V. It doesn't really matter that the voltage isn't *exactly* 1.0500…V so 5% tolerance on the resistor which will translates to a possible +/- 5% on CPU_VCCST_PWRGD doesn't matter. PP1V05_S0 itself will not be *exactly*...

Yes, with open-drain output, when output MOSFET of the IC is off, the output is high impedance, ie. not driven, or floating. So something else is driving it, which is the pull-up resistor R1931, pulling it to PP1V05_S0. So in this case CPU_VCCST_PWRGD will be 1.05V if ALL_SYS_PWRGD and...

This cannot work on anything starting from 1st gen Core i, you need to clean ME region when transferring from another board.

2W of power when off sounds high. Maybe still a short to ground on some power rail. T2 is at least partially working if USB-PD at 20V is negotiated, should be enough to get DFU.

ME region cleaned properly when swapping SPI ROM?

A1707/A1708 does not have T2. LCD assembly can be replaced without problem if you are able to find a good quality one, there's a lot of garbage on the market. Actually it can also be replaced without issue on machines with T2, the problem is that it's extremely difficult to find good LCD...

Known good battery?

You should disable power going to the GPU one way or another so that it doesn't try to initialize. A random kernel panic can happen so maybe it was just bad luck. If it does it everytime you should run Memtest and try on another storage device. Also if you are installing from USB drive, try a...

TJunction is 105°C for this CPU so it should be "fine" (as in that's how Apple does thermal design — look at max temp and do a cooling system that can keep it just below). Fan should ramp up when it gets close to that temperature but it always takes a while. I'd first suspect software or drive...

It was looking ok under it but it may have gotten damaged anyway. Board was already cleaned in USC before I got it.

In my case replacing U6400 and C6405 seems to have fixed the problem. U6400 is involved with the bias circuit and C6405 was corroded. I think U6400 was actually the culprit but since I missed the corroded C6405 at first I replaced it at the same time.

You can rework the outer row of pins with the soldering iron but it's not possible to rework the inner rows. This could last long enough or fail again very soon though, not really a proper fix so better max out the working slot.

Make sure you don't touch the probes when measuring and you use a decent multimeter (10MΩ input impedance), since INTRUDER# has a very weak pull-up of 1MΩ is it pulled down very easily.